title: The Communicative Participation Item Bank (CPIB): item bank calibration and development of a disorder-generic short form.
abstract: OBJECTIVE
  The purpose of this study was to calibrate the items for the Communicative Participation Item Bank (CPIB; Baylor, Yorkston, Eadie, Miller, & Amtmann, 2009; Yorkston et al., 2008) using item response theory (IRT). One overriding objective was to examine whether the IRT item parameters would be consistent across different diagnostic groups, thereby allowing creation of a disorder-generic instrument. The intended outcomes were the final item bank and a short form ready for clinical and research applications.
  
  
  METHODS
  Self-report data were collected from 701 individuals representing 4 diagnoses: multiple sclerosis, Parkinson's disease, amyotrophic lateral sclerosis, and head and neck cancer. Participants completed the CPIB and additional self-report questionnaires. CPIB data were analyzed using the IRT graded response model.
  
  
  RESULTS
  The initial set of 94 candidate CPIB items were reduced to an item bank of 46 items demonstrating unidimensionality, local independence, good item fit, and good measurement precision. Differential item functioning analyses detected no meaningful differences across diagnostic groups. A 10-item, disorder-generic short form was generated.
  
  
  CONCLUSIONS
  The CPIB provides speech-language pathologists with a unidimensional, self-report outcomes measurement instrument dedicated to the construct of communicative participation. This instrument may be useful to clinicians and researchers wanting to implement measures of communicative participation in their work.
authors.affiliation: University of Washington, Seattle, WA, USA. cbaylor@u.washington.edu
authors.forename: Carolyn
authors.initials: C
authors.lastname: Baylor
authors.forename: Kathryn
authors.initials: K
authors.lastname: Yorkston
authors.forename: Tanya
authors.initials: T
authors.lastname: Eadie
authors.forename: Jiseon
authors.initials: J
authors.lastname: Kim
authors.forename: Hyewon
authors.initials: H
authors.lastname: Chung
authors.forename: Dagmar
authors.initials: D
authors.lastname: Amtmann
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000690:Amyotrophic Lateral Sclerosis / Q000150:complications; D002138:Calibration; D003142:Communication; D004185:Disability Evaluation; D004401:Dysarthria / Q000175:diagnosis* / Q000209:etiology; D005260:Female; D006258:Head and Neck Neoplasms / Q000150:complications; D006801:Humans; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000150:complications; D010300:Parkinson Disease / Q000150:complications; D015203:Reproducibility of Results; D057566:Self Report / Q000592:standards*; D012919:Social Behavior; D011795:Surveys and Questionnaires / Q000592:standards*; D014832:Voice Disorders / Q000175:diagnosis* / Q000209:etiology; D055815:Young Adult
keywords: assessment; communicative participation; dysarthria; item response theory; outcomes; outcomes measurement; voice disorders